Plenum Design
04-29-2005, 07:14 AM
#1
Senior Member
Thread Starter
Join Date: Jun 2004
Location: Germany
Posts: 240
Hi,
i'm wondering, what purpose a plenum has and how it effects performance.
the FC manifold does have a plenum, the FD one doesn't.
there are larger plenums, smaller ones...
but why?
could anyone give basic hints about plenums in generall or point me to some useful sources?
thanks
Chris
i'm wondering, what purpose a plenum has and how it effects performance.
the FC manifold does have a plenum, the FD one doesn't.
there are larger plenums, smaller ones...
but why?
could anyone give basic hints about plenums in generall or point me to some useful sources?
thanks
Chris
04-29-2005, 07:40 AM
#2
Senior Member
Join Date: Jan 2003
Location: London, Ontario
Posts: 2,871
You need this.....
http://www.amazon.com/exec/obidos/tg/detai...=glance&s=books
A plenum can be tuned to use the pressure pulses created by the intake ports. With the right size plenum and intake runner length, the pressure rises in the intake as the intake ports open to help push more air into the combustion chamber. (this is one super simplified take on it)
http://www.amazon.com/exec/obidos/tg/detai...=glance&s=books
A plenum can be tuned to use the pressure pulses created by the intake ports. With the right size plenum and intake runner length, the pressure rises in the intake as the intake ports open to help push more air into the combustion chamber. (this is one super simplified take on it)
04-29-2005, 10:56 AM
#5
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Join Date: Mar 2002
Posts: 126
[quote name='Old Splatterhand' date='Apr 29 2005, 09:25 AM']judging by the reviews it must be a really nice book.
thanks for the hint, guys!
edit: it's pretty old though
but i guess it's nice to know the basics
[/quote]
THat book is heavy reading for most people. Expect to read and reread if you not familiar with the basics.
thanks for the hint, guys!
edit: it's pretty old though
[snapback]706140[/snapback]
[/quote]
THat book is heavy reading for most people. Expect to read and reread if you not familiar with the basics.
04-30-2005, 08:39 AM
#7
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Join Date: Oct 2003
Location: Boston Ma.
Posts: 1,420
[quote name='Old Splatterhand' date='Apr 29 2005, 07:14 AM']
i'm wondering, what purpose a plenum has and how it effects performance.
the FC manifold does have a plenum, the FD one doesn't.
[/quote]
Im guessing it has an effect on torque or low end power, cause the cosmo RE has a large one.
i'm wondering, what purpose a plenum has and how it effects performance.
the FC manifold does have a plenum, the FD one doesn't.
[snapback]706100[/snapback]
[/quote]
Im guessing it has an effect on torque or low end power, cause the cosmo RE has a large one.
04-30-2005, 09:26 AM
#8
Senior Member
Join Date: Dec 2002
Location: fredneck MD
Posts: 4,107
[quote name='kahren' date='Apr 29 2005, 12:42 PM']the fd manifold does have a plenum, its just not very big.
[/quote]
In the actual intake manifold there is basically no plentium.
[quote name='RONIN FC' date='Apr 30 2005, 08:39 AM']Im guessing it has an effect on torque or low end power, cause the cosmo RE has a large one.
[/quote]
I dont think big plentiums help so much in the torque department. Long skinny runners are the big helpers there.
im still learning so...
[snapback]706205[/snapback]
[/quote]
In the actual intake manifold there is basically no plentium.
[quote name='RONIN FC' date='Apr 30 2005, 08:39 AM']Im guessing it has an effect on torque or low end power, cause the cosmo RE has a large one.
[snapback]706445[/snapback]
[/quote]
I dont think big plentiums help so much in the torque department. Long skinny runners are the big helpers there.
im still learning so...
06-03-2005, 01:17 PM
#10
Senior Member
Join Date: Jan 2003
Location: London, Ontario
Posts: 2,871
[quote name='TYSON' date='Apr 29 2005, 08:40 AM']You need this.....
http://www.amazon.com/exec/obidos/tg/detai...=glance&s=books
A plenum can be tuned to use the pressure pulses created by the intake ports. With the right size plenum and intake runner length, the pressure rises in the intake as the intake ports open to help push more air into the combustion chamber. (this is one super simplified take on it)
[/quote]
Bah, that book had one picture of a plenum intake as something new and futuristic. Overall was not impressed.
http://www.amazon.com/exec/obidos/tg/detai...=glance&s=books
A plenum can be tuned to use the pressure pulses created by the intake ports. With the right size plenum and intake runner length, the pressure rises in the intake as the intake ports open to help push more air into the combustion chamber. (this is one super simplified take on it)
[snapback]706105[/snapback]
[/quote]
Bah, that book had one picture of a plenum intake as something new and futuristic. Overall was not impressed.